Green sea-fingers (tomentosoides), Codium fragile subsp. fragile


Short description of Codium fragile subsp. fragile, Green sea-fingers (tomentosoides)

A spongy green seaweed with numerous Y-shaped, branching, cylindrical fronds; may reach 70 cm high but in Britain usually to 25 cm. The fronds have a felt-like texture and a disc-shaped holdfast formed from many fine filaments. Can be distinguished from native Codium tomentosum by microscopic examination. 

Description of Codium fragile subsp. fragile, Green sea-fingers (tomentosoides) status in GB

Established around GB including the Scilly Isles, Channel Islands, South Wales, the south coast of England, the west coast of Scotland to Argyll.

Habitat summary: Codium fragile subsp. fragile, Green sea-fingers (tomentosoides)

Occurs on rock and coralline algae in pools and on open rock from the mid to lower shore, and in shallow subtidal waters.  On sandy or muddy bottoms it attaches to bivalve shells, rocks or artificial structures. It mainly inhabits protected bays and estuaries but also occurs on semi-exposed shores.

Overview table

Environment: Marine
Species status: Non-Native
Native range: Hokkaido, Honshu, Kyushu, Shikoku
Functional type: Algae (macroalgae)
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: River Yealm, Devon.
Date of first record: 1939

Distribution map

GB Distribution from NBN Atlas

Author's name:

Natalie Sweet

Last updated:

June 10th, 2011

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